Variable cut-off for engines



(No Model.)

W DE SANNO VARIABLE GUT-OPF FOR ENGINES.

Patented May 27, 1890.

W/ TNE SSE S UNITED STATES PATENT OEEIcE.

VALTER DE SANNO, OF OORRY, PENNSYLVANIA.

- VARIABLE CUT-OFF FOR ENGINES.

SPECIFICATION forming part of Letters Patent No. 428,861, dated May 27', 1890.

(No model.)

To all whom t may concern:

Be it known that I, WALTER DE SANNO, of Corry,in the county of Erie and State of Pennsylvania, have invented a new and Improved Quick Valve-Motion and Variable Out-Off for Engines, of which the followingr isa full, clear, and exact description.

My invention relates to improvements in cut-off mechanism for engines, and may be used upon stationary or locomotive engines.

The object of my invention is to provide a quick valve-motion and variable cut-off and means for quickly changing the stroke of the cut-off, and also to provide a cut-off that is simple, efficient, and that maybe operated by a single eccentric.

To this end my invention consists in aslidevalve for openin g and closing the ports of the cylinder, a connecting-rod which connects said slide-valve with an operating-lever, a lever to which said rod is attached pivoted to the side of a rocker-lever, and a sliding block attached to said operating-lever and provided with suitable rods by which it may be moved, so that the position of the slide upon the lever and consequently the stroke of the cut-off rod may be quickly and easily changed. This construction will be hereinafter fully described, and specifically. pointed out in the claims.

Reference is to be had to the accompanying drawings, forming a part of this specification, in which similar letters of reference indicate corresponding parts in all the views.

Figure l is a side elevation of the attachment as applied to an engine, the cylinder and slide-valve being shown in longitudinal section. Fig. 2 is a vertical cross-section on the line a; :c of Fig. l; Fig. 3, a horizontal section on the line y y of Fig. l, looking downwardly; Fig. 4, a detail view of the rocker-lever; Fig. 5, a detailview of the intermediate or operating lever, and Fig. 6 a View of the device as applied to a locomotive.

The operating mechanism is mounted upon the side of an engine in the rear of the cylinder A, which is of the usual construction. A rocker-lever B is pivoted to the upright frame C, which is attached to the side of an engine by a suitable pin,which is indicated by dotted lines in Figs. 2 and 3, the lever being pivoted in such a manner that its longer end will be below the pivot and its shorter end above. The lower end of the .rocker-lever B is pivotally attached to the end of the eccentric-rod D, which has a reciprocating' motion,is operated in the usual manner, and causes the rocker-lever B to tilt upon its pivot.

To the upper end of the rocker-lever B is pivoted the intermediate lever E by the pin a. The upper end of the lever E is pivotally attached to the rear end of the valve-rod F by the pin b, and the lower end consists of a curved arm E', which passes through the sliding block H, which may be adjusted thereon to regulate the stroke of the valve-rod F. The sliding block H is pivotally attached to the link J, which extends rearwardly and is pivoted to a bracket C of the .frame C by the stud d, which is attached to the bracket C and passes through the end of the link. The block H is also supported and adjusted by the rod e, which is attached to the outer side thereof by the pin f, and which extends upwardly and is attached to the forward end of the bell-crank K.

The bell-crank K is pivoted'at its elbow to the bracket L of the frame O by a piu g, and its upper end is connected witha rod h, which extends rearwardly to a point where it may be easily reached by the engineer, so that 1 by moving said rod the bell-crank K may be turned upon the pin g, and the block H, which is connected therewith, may be moved upon the arm E of the lever E, and the stroke of the valve-rod F changed, as will appear hereinafter.

The valve-rod F extends forwardly into the steam-chest A of the cylinder A, and is attached to the slide-valve M, which is actuated thereby and reciprocates in the steam-chest, thus alternately opening and closing the inlet-ports N of the cylinder A. The slidevalve M moves on its seat in the steam-chest A in the usual manner, and is provided with an interior recess M', which is open at the bottom, and which allows the exhaust-steam to pass from the cylinder through ythe same and into the exhaust-port P, over which it passes. This is clearly shown in Fig.1. When IOO the slide-valve M is in the forward end of the steam-chest, the direct steam entering from the pipe A2 will enter the rear inlet-port N to the cylinder, and the exhaust will pass from the forward end of the cylinder through the forward port N and recess h of the slidevalve M to the exhaust-port P.

The device is operated as follows: As the eccentric-rod D moves backward and forward, it moves the lower end of the rocker-lever B and causes it to tilt or oscillate upon its bearing-pivot, so thatthe intermediate lever E, which is attached to the upper end thereof, will be moved also, and as the lower part of the lever Eis held by the block II the lever will oscillatc about its pivot a and impart a reciprocating motion tothe valve-rod F, which is attached thereto, thus moving the slidevalve l\[ in the steam-chest A and regulating the cnt-olf. By attaching the intermediate lever E in this manner the rod F and valve M will be moved much quicker than when connected in the usual way. lf the length of the cut-olf stroke is to be lengthened, the operator pulls upon the rod h and raises the forward arm of the bell-crank l and the rod e, thus raising the slide-block Il upon the arm E', and bringing it nearer the pivot or fulcrum aand lengthening the stroke. lf the stroke is to be shortened, this action is reversed, the rod 7L is pushed forward, and the sliding block ll depressed, thus moving it away from the pivot or fulerum a and shortening the stroke.

From the foregoing description it will be seen that the cut-off mechanism will be positively operated by one eccentric, and that it may be easilyT varied and regulated.

lVhen the device is used on a stationary engine with a direct-acting valve-motion, the eccentric connection is made with the lever F., as indicated by the dotted lines in Fig. l, and when used with an indirect motion the eccentric connection is made with the lower end of the rocker-lever l, as shown and described. \Vhen the device is applied to a locomotive, the lever llzis pivoted to the upper end of the rocker-lever 3, its upper end is pivoted tothe valve-rod F, as described, and its lower end is pivoted to the link J, which is suitably attached to the side of the engine. The curved arm E and slide-block ll are not necessary in' this case, as the change of the stroke of the valve-rod is effected by the locomotive-links in the usual manner, the object of the lever E2 being simply to give a quicker motion to the valve-rod.

It will be understood that in locomotives to which my improvements may be applied the reversing of the engine is accomplished in the usual way from the eccentrics. I do not substitute anything for the links or eccentrics, and merely slierten the upper arm of the ordinary rocker, pivot my lever E2 thereto, connect lever E2 at one end to the valve-rod F, and brace it at its other end by the link J.

lVhile I have shown a rod e, bell-crank K, and rod 7L for operating the block H, l do not confine myself to this particulararrangement of rods and levers, as other suitable means may be employed.

llavin g thus described my invention, I claim as new and desire to secure by Letters Patentl. A quick valve motion and cut-off for engines, consisting in the rocker, a rod connecting it with the eccentric, a lever pivoted bctween its ends to the upper end of the rocker, a valve-rod connecting the upper end ot' the said lever with valve to impart a quick motion thereto, and a link mounted on a fixed pivot or axis at one end and connected at its opposite end with the said lever below its axis, substantially as set forth.

2. A quick valve-motion and eut-off for e11- gines, consisting in the rocker, a rod connecting it with the eccentric, a lever pivoted between its ends to the upper end of the rocker, a valve-rod connecting the upper end of the lever with the valve to impart a quick motion thereto, and a link mounted on a fixed axis or pivot at one end and adjustably connected at its opposite end with the lower end of said lever below its axis, substantially as set forth.

3. In a cut-oft for engines, the combination, with the rod D, rocker-lever li, and intermediate lever E, having curved portion E', said parts adapted to operate the rod F and slidevalve M, as shown, ofthe block ll, link J, rod e, bell-crank K, and rod h, adapted to regulate the movement of the lever E and of the parts attached thereto, substantially as described.

l-. The combination, with a rocker lever pivoted behind and in line with the enginecylinder and havingits lower end connected with an eccentric-rod, as shown, of an intermediate lever pivoted to the upper end of said rocker-lever, having its upper end connected with the valve-rod of the steam-chest and its lower end retained in a link suitably attached to the side of the engine, said lever being adapted to quicken the stroke of the valve-rod, substantially as described.

VALTER DE SANNO.

lVtnesses:

F. L. Fono, Clins. F. MoFFE'r.

IOO

TIO 

